For the StripMeister  Original and E250 #18 to 250 MCM or about 3/4 inch OD with insulation on.

For the StripMeister E350x #18 to 500MCM or about 1 inch OD with insulation on.
For the StripMeister E1000 #18 to 1000 MCM or 1.4 inches including insulation

For the StripMeister E2000x #18 to 2000 MCM or 3 inches with insulation on